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Related Experiment Videos

A pulse ribbon model of monaural phase perception.

R D Patterson1

  • 1MRC Applied Psychology Unit, Cambridge, England.

The Journal of the Acoustical Society of America
|November 1, 1987
PubMed
Summary

Listeners can detect changes in sound phase spectra, with local phase shifts depending on signal properties. Global phase shifts are detectable with minimal time delays, independent of most signal features.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • The human auditory system processes complex spectral and temporal information in sounds.
  • Discrimination of phase changes in sound is crucial for auditory perception.

Purpose of the Study:

  • To investigate the ability to discriminate changes in the phase spectra of wideband periodic sounds.
  • To explore the influence of local and global phase changes on auditory perception.
  • To develop a simplified model explaining the results.

Main Methods:

  • Two sets of experiments were conducted using local and global phase changes in auditory filter outputs.
  • Discrimination thresholds were measured under varying signal parameters (repetition rate, intensity, spectral location, bandwidth).
  • A simplified cochlear model was developed.

Main Results:

  • Local phase change discrimination depended heavily on signal repetition rate, intensity, and spectral location.
  • Global phase shift discrimination was possible with a 4-5 ms time delay across channels.
  • Global phase shift discrimination was largely independent of signal parameters besides bandwidth.

Conclusions:

  • Auditory phase discrimination abilities are complex and depend on the nature of the phase change (local vs. global).
  • A simplified cochlear model can account for the observed discrimination patterns.
  • Findings challenge assumptions about the independence of phase discrimination from signal parameters.

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